Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c3050ff87ef89b…

MALICIOUS

PDF

82.3 KB Created: 2021-03-07 11:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdd3b524f61bc50316e4d20a4db433d1 SHA-1: 9907cc6e3fdf7e208452878f5f3a5c129c3a7a01 SHA-256: 59c3050ff87ef89bffadf89da438bc35b5a02f081a5f56466c7d30aa3d7ebb4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=will+vizio+sound+bar+work+with+samsung+tv PDF link annotation
    • http://reduslim-officialsite.site/whats_a_wimplezm5ic.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/34904528594.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/student_information_sheet_google_form.pdfIn PDF document text
    • http://grampus-shop.com/free_physics_textbook_downloadkqfy4.pdfIn PDF document text
    • http://vseti.life/t-_mobile_store_hours_near_mebxdk4.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/he3Ni6J/auto_clicker_axe.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/51168716619.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/how_to_set_up_the_stealth_cam.pdfIn PDF document text
    • https://cdn.sqhk.co/rawegili/jjihPvN/6682131008.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/kezaxafi.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/14xgiEU/fadutogove.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/3aRFg0d/neposonomip.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/narofaliwajenuvaves.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/icpmogg/battleground_survival_offline_apkpure.pdfIn PDF document text
    • http://ufenmac.com/ray_dalio_principles_ebook_downloadw6wch.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/48947462070.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/que_es_una_empresa_autorretenedora.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/which_kitchenaid_mixer_is_better_for_bread.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifavamifikas.myartsonline.com/71406712236.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/tableau_online_training_and_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/mcdonalds_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/duns_and_bradstreet_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/14480446224.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 5656 bytes
SHA-256: 8b363d526584ba4a194ccbb8dc7e69397f22f7fb44e4f7e1d8196cf486718d46
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10688 bytes
SHA-256: a12746b6e90eded58d997088915d9f2c775595d52ea915602794be2591e9119e

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